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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c6703c2010cd431c32db461ae41eca76a702789c3ff6eaa7d7db534b65a1544' 
  AND token = 'HYTqZwKBXlIm0dOpOP5BbLup85Z0A2+0BSPqjQH0ysg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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