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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a7452966e9ec43e29fd20eafea9eb5292ea2f3805c7c42bbee2083d7ba42fe' 
  AND token = '1XBabjttDF4be+9FgOak8O2XQU3o5bsU0zueoALnhtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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