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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd9f47a15a6d3fd558e6775493db91f4bf438f29be7fb2033805920de20d963' 
  AND token = 'JpJC/09Rrj5Wev/ysRlAMM9OaTjcnjslasLJEvRvpgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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