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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011ac9c6f0a19d1e9f804f5b2a6d532a6f6c3a597ea14892eba8b349c8db1569' 
  AND token = 'x8QmzhAePek6tyMVanw6VYBsdlzaelqz79I0ecCpHtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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