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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160c222d39835493980901330db435c37224f28f15a8c4475af3ad7e940e02d1' 
  AND token = 'tdafrcdnFHR5htu7kdqtFrSScmbQPc4J7l3KI6aZed4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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