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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd08c3f295aeef31581f27e3cb0fe6e2d0455c6c9cb760a53b326013620bc86e' 
  AND token = '0UsNOxj2vfsuNUopWoNOnNGFiF1utrSG8xTbpgQ8c28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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