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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4cc0eaa0303fb4ee74df0c3bbd3550dde83dfa31d2dd9612fbf724450b192d' 
  AND token = 'O9n3Tzpn8WIfhaBmQ4OK2LfreQ6T+qmUdkJW0IbMkw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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