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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca99aaa091b25820c252668629020e63eaa49becae7d41bbf3783a14f07dada' 
  AND token = '6MecqHArVnJ64FYwlVfcHGEdpiIYxs3UVRwAtWZL0cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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