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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e38dc93e1cfdf55905eb1c8a1d13302bfc9250aed0ab49ee74430ae2aacc552' 
  AND token = 'TYQPzZ5cu9yGeN1RWSgwPMTF2saproWMl10xrMWKi0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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