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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f16fb23719a5fb47ddf036f61d94831c9f74be3d88441dd51deff4d3804c33' 
  AND token = 'a2KRegQ9aC2QFgQg+yyAvY0NOgZOfpUprPY4GJQ3wPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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