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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c43df9fb76ca96e4e592e8a6d95809abb1e57bfbfae8f5c79e69d6ef6f8bb2c' 
  AND token = 'Bc8Gl0ftdeSmfPbNsGekLKzzM90Ogfq5Oo3ZQITO7/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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