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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab8e31a183c9e7957cec685b71666d7f371a9945590670f208ae0b0e9eb5504' 
  AND token = '7YU7mgS+z8TCrJGBF61YZJImIO/3MBk5nIkmtVUxpk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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