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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c27b4974a709b5621e0c8878a6db7717350beb899446564b5b936e80fa7fa8' 
  AND token = 'sDsehmNQvzcqRJzLXBsFTVu534BoDACUQRxL9MNUCrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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