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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f50e7f0406127d56f9594b7c124cdf3bb7d97025f60714f6eb8899f07cfcd99' 
  AND token = 'tl/gOm3sEe2libEaGP4sPtp30RbAenv1ZxZUdxU0+yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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