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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b24fefa4d16436d3ed55a5e19ae2459a186b5e18bab50c5ead605a0d7a2ccf' 
  AND token = 'iStDFGyLZ2sy2l3TG16WZTfFWq5kGmooKtLvz5mpYZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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