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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88e902656686b4a2b132c4f12978e07978601ec5b991c759afb17fd2dddba09' 
  AND token = 'ot+vrVdZmLmSueIe5hQa+GkuakzpzkkYxdFYuuXTe5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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