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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e83fa915d5b93a0342d30ddf1ba345c176a6ad382bbd89ad8ffd1c41c2faab1' 
  AND token = '5h9SRjTTcK1A0rV07VeP0s02+j/ZoaaAQ5OJNnqlUdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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