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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15cc787e89fad0e4b660204559029db17e6f9beafd59a7a53776d6e638a7ea73' 
  AND token = '20epq9bt5Jy3eiPFxxYhpMsaodZQFKQnwwcvN2UszNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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