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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdecfb21ab73a5fb77b03341cae5ab84708d33c230eb6ec4395c446e34bd327' 
  AND token = 'DMctXI0XE9YAa1e+KrccuxyL2LL0D9rarmmj5JN/Dw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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