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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a6f817033757f1b79c192d8a6c2abfdaefaa307f8fcf0fe3ad543e4c70de7f' 
  AND token = 'Cj+jqN5GfMAQShF2vC1p/y88IsGU7PJ/CnZFAG52/Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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