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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736a92be3a06e3eab67a3083ac5aec1bead817eb851e288f51bb123515493bbd' 
  AND token = 'QLfAJ3qw2sJLkmJMSpyRwju668LCsJaNbgSq6VCTxXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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