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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c20f3a13bfa6235c647ec73f107abc03d791f2f7e46feabac11ffe1f077c7a' 
  AND token = 'rtBmhUxSV53AT6AzfmXEamZAUVwYALhjfjg2FCmRxEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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