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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bee083672c2a2e3ac365c8f8cefa9fb6e624f662dbe6763e83a32899fc9ce5' 
  AND token = 'j5UdLb4J65xHl3pmeqqLf7pfdVZXF9RmHF4Gae+xiao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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