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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2fc7fa3b7a71394bd482844ae0a04213722139ae85704fb98d976067d1e82da' 
  AND token = 'lOy2TBCnIWk/WKRyYZgpiw9urrrTONMNb5o97uE1Lnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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