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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29cae147ae45bf67d3116230b3ac4bfa8d7b1c3874aa03dd3bb468a616b1b103' 
  AND token = 'otwFbyck0jtuPFTgEsSJwn0/heq/IYMsVssLQc66PFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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