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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e41d3c4a3e4f844bccc9be3380857f2acb596c3c665cd14436e1ca2db13839b' 
  AND token = 'ZucYdc4bQUCHChOe17r6w8u0Vm0B4Xt9uE+U8XENwtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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