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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d09de4baeb15fb9fc0f6a55975c8aa301d9f0b243177738d05ce02533ffaf7' 
  AND token = '7uXnRetPhaTA6yp+KJwZiSr00REBTG1/MH8k7bL0fiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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