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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbaf25dd5068ba1b34f05360be5726d8718c73f88cbc90baff94e28d29930be' 
  AND token = 'vx2Rf45Y3BF2kp0mRnq4fysCg4YoF2vlO1UNVrBUZdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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