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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '355b31442880e9547866ac7d9fa968ae364757ba2a9ed42811ec9a68c312b781' 
  AND token = 'iKoPNVCCaYj4a5vVSA7TQ2bh6BA0jyqXV0DMdaHHSko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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