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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f71cefb0c20a78836e943d36873dab9e07b5cd1861cea07c61483454686527f' 
  AND token = 'awhF3OGbnDATyrwHCRlln96wgcTJmh13SUi42s7AK70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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