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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbc9f941aabe357888ca9f74473645db04315befc397ff444ed3acc2b389e36' 
  AND token = 'P0S8rx5QhdOGZOMTL7I2FSjl19W4mhIixdMRFDUe/4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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