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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db098d3019fd594bb08d60d9e4fe19720e0bfb0272fed7c6eec9f8334dbb37b' 
  AND token = 'DZAJ3NFPZxJtQ7ks2t6D1DtAzKLLRJEbkLfRdwZOUoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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