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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe23ac6feb46f78e66d57b5b53078fc429e1199e494e9f05c7e14b66c5c0c449' 
  AND token = '3wP5H4nlGxJxreUpr4hjESLBOFptoOndWpv+gfhWX4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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