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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f751fb6593bc118665440246238ddbc998cbc345c067b2e37223873993e0d14' 
  AND token = 'XXZtOErrxcnH082Vv1Ga6YWB59SgdgwQcCKeXTi36SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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