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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35be2e5283561be54ea1c7b4a6ee1293e6eb41cddd2eb983dd0e28761fc5b84d' 
  AND token = '/1q1I1S05Ell6bu+z/TaOhEbapsepUQNw4v8uZtGuD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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