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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ed6c5a8b336a632cac6e35c74d44e5136c29d15ed19a2f55970bd3f046bb55' 
  AND token = 'zKAhRvsPoG4RihUy8rJRYHD0J7laWl6WO211gvN4qKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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