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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dccea3ae77d2d3d8b86ed44c81696f7b279b2072cae857706176df61537f8289' 
  AND token = 'Y0JEqvuE/ek16NX1cBitnB0p7mmcjhZbWYqG1hBsY+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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