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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed34438b575e231b9f30eae217b864faac2bb6fe3b263517e560396ed61dc10' 
  AND token = 'zCvYnsLA5i3C50D0yQ/LKq5Pl6NF5+cylau5tPIAv78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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