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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e78fb4ecc384e7071dcfdd7b989eaa8cbe5f75b84a9bf279867f6f5bd76bea' 
  AND token = 'kKxX0vRuyjzYUe/faDIlej2DRh+9JoVA2ruRpmzioHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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