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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08d9d91ef1d864af3a66938b61d82e9e4bf387d9a716a37a8d35bd2d4a230d5' 
  AND token = 'dWdFnQxNgNthjb3vLadA0J436E0+5ETR6yq4ECMHWHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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