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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5413879309e4d53c06eb3dcb68a948de3a0e49e53fd03cd0384bfa29430287' 
  AND token = 'KRZmUoGauhWd3J87vfQu6lsUjkiDU7rpN06NTX7X2xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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