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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0b09b8b4ddbb27df9c5aad1f77ed74cecd2aff6f587ef00b9ea92e7a9f7445' 
  AND token = '1kmhUwIiaqvAK+eqvGdQPmr5PEyeu6tjCFr9CCHlIm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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