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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37703a859ac2ffc13a8d358411813b7cbccf08b0df2417d1edcc237a8f6d5533' 
  AND token = 'uUloMN3ktmbqsOalv8c4L4OFEQ86+byMrXm8iz3vNBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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