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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e71efc3c10c90a17c1c932affeeda55e9e831d86379945e49ceeac8cea4f5f' 
  AND token = 'k23hV4UFeb8tXRAf/PAmea03BV/nQ6tPqM3V8dhns7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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