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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f54ac10dfdf0417812cf5a0b8f5d17f63c530b83e603e0da811068ca8c32807' 
  AND token = 'j99dse4Ad/UN/CcwDJvIBPkNEMiqrt8Y89CB4MMGd+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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