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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392f234fcae99baba1a4da0f85aa68c2470eb6b617fb84586e38ef81d103aa7b' 
  AND token = 'v6tx3D89iDFSyaIRfVNaiBWxXBZgxnNPYh3tfFK1QOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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