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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f33a2e75bcae87ceda2f3ed456e5621339b27d1ec671b71869e0b22ea06645e' 
  AND token = 'YCWk91nrsFYxB05lUGVsY77H5mz9NAcbzmivWWCX9i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}