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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1f629bcf483dd13d7eccf4dc5a02851bd536f295dcf369c8a3d87c6551927d' 
  AND token = 'UhXo/rhpCBcNfcioVIbBoUCHSx0mG12wmQuN+CmU6mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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