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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e902650c97000b9ea7ad9ff099dc9a6ec5fcd9d6ea12089e5b6e893e6eed297a' 
  AND token = 'ETRrRmg86lKzAICeG73L8R2HQXUm1SeJ3uYjFdnAUew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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