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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e3397922ea042b0f4faa667b7c3174b9f053acb57330dd0e91c51c6ec3446b' 
  AND token = 'A3FePeLFdlcuS4Yz79W4H6K+hXt3UONngZT+djrkth4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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