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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8738c44b8229b975929e8eedea6fefff5678c1c8d3c54e1e73351b590a34e04' 
  AND token = 'mM/uDK5GG2CsdiSZAmO7KJR4AMJ/zpVkWsyvJSX/S1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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