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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db36a53d61408eccbfe0ac4897aac9e827346934271d2e7fd5572c260c04501d' 
  AND token = 'en3HWzMON/nWqsl4MBss8Cia84SP0ARlM+bsn0zTGnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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