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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474ee6b214d663b74481ac919ba8e23c5b3b6d78fc09f95e70121b2aff2a2dc5' 
  AND token = 'r63wx6gA4uhtPO+kv6ffj9uJELBXDmEPN9wbO9d/VDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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