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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9049bd6012b408e8aa740484d9e4b1b1a85052e55483284b01f9757c10ae3a2c' 
  AND token = 'FenX6XMdF626pv6dwX3JNaFmYvAo3MUHjTFICfWM6Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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