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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871576bde9201fca929d73826c0d7c987c3740dd9dc58b4e70bffee2da55b03f' 
  AND token = 'PvV5m2tDJEymxBa6oIudUctd16gU4zRWjlfyj3zV38U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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