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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3ac61a500a0d4d48ab8bddaca59f06c122db80f29468e1ac0570cf8fdd688b' 
  AND token = 'UXFIYb38X3UCB6Fly7M76pM92RgwNQRv+BUVmIFePt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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