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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b789ed63828febb24f8fd28817928b2aa64b01ee17cf2fb67d2cd3e3458c4c' 
  AND token = 'T+Pen7AA+PcG0UUxwGqo2wIKac8ZV3WApw7exwu9Hk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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